Filter wrappers doubt?

Do we have to face questions from the real compression filter code for the real exam?? Also what are the other ways to zip or compress the o/p stream other than the one given in the book. Any help on this appreciated.

SCJP 1.4, SCWCD 1.4 - Hints for you, Certified Scrum Master
Did a rm -R / to find out that I lost my entire Linux installation!